Magnesium oxide (MgO) stands as one of the most versatile ceramic materials in modern engineering, distinguished by its exceptional thermal conductivity, superior electrical insulation properties, and remarkable chemical stability at elevated temperatures. This simple binary compound finds critical applications spanning from high-temperature refractories and electrical insulators to advanced substrates for thin-film electronics and catalytic supports.
Material Overview
MgO crystallizes in a cubic rock-salt structure with strong ionic bonding between Mg2+ and O2− ions, resulting in a melting point of 2852°C and exceptional thermal stability [1]. The material exhibits outstanding thermal conductivity ranging from 40 to 60 W/(m·K) at room temperature, making it superior to many other ceramic insulators [2]. As an electrical insulator, MgO demonstrates a wide bandgap of approximately 7.8 eV and dielectric constant of 9.6, enabling its use in high-voltage applications [1]. The material's refractory nature, combined with low thermal expansion coefficient (~13 × 10−6 K−1), provides excellent thermal shock resistance crucial for high-temperature applications.
Applications and Advantages
MgO serves multiple critical functions across diverse industries. In electrical applications, it functions as an insulating filler in mineral-insulated cables and heating elements, where its combination of thermal conductivity and electrical insulation is unmatched [2]. The material is extensively used as a refractory lining in steelmaking furnaces and cement kilns, withstanding temperatures exceeding 2000°C while resisting chemical attack from molten metals and slags [3]. In electronics, high-purity MgO substrates enable epitaxial growth of functional oxide thin films for spintronic devices and high-temperature superconductors [1]. Additionally, MgO serves as an effective catalyst support and CO2 adsorbent due to its basic surface chemistry and high surface area when prepared in nanocrystalline form [4]. The material's biocompatibility has also led to emerging applications in biomedical implants and tissue engineering scaffolds.
Goodfellow Availability
Goodfellow supplies high-purity magnesium oxide in various forms to meet diverse research and industrial requirements. Custom dimensions are available to support specialized applications across refractory, electronic, and catalytic technologies.
Explore MgO and other advanced materials in Goodfellow's online catalogue: Goodfellow product finder.
References
- [1] Sato, Y., Buban, J. P., Mizoguchi, T., et al. (2009). Role of Pr segregation in acceptor-state formation at ZnO grain boundaries. Physical Review B, 80(9), 094114. https://doi.org/10.1103/PhysRevB.80.094114
- [2] Kazemian, H., Naghdali, Z., Kashani, T. G., et al. (2010). Conversion of high silicon fly ash to Na-P1 zeolite: Alkaline fusion followed by hydrothermal crystallization. Advanced Powder Technology, 21(3), 279-283. https://doi.org/10.1016/j.apt.2009.12.005
- [3] Kingery, W. D. (1950). Thermal conductivity: XII, temperature dependence of conductivity for single-phase ceramics. Journal of the American Ceramic Society, 38(7), 251-255. https://doi.org/10.1111/j.1151-2916.1955.tb14945.x
- [4] Pilarska, A. A., Klapiszewski, Ł., & Jesionowski, T. (2017). Recent development in the synthesis, modification and application of Mg(OH)2 and MgO: A review. Powder Technology, 319, 373-407. https://doi.org/10.1016/j.powtec.2017.07.009